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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94d8f6bffab5e38bfb13a9e6ca1459c1c9c6a8b5bf379be0a1df5e0541babe4' 
  AND token = 'MOh7O6Xp7e4mb1jEkJLdtMbxDXHF3Q+H7jeYVEHCu8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00111

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}