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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cea3752489f69d42daa6c7e50010cafe56d4aeb7140650d797224a64909ba7f' 
  AND token = '3CHvliyh2mXrASruNP+n0VZDD00tAOoJp/neyRqwNHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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