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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62ab3e512f4aad03230b3b894ec29e1f96b967e24e05d0e91a1da00baaee583' 
  AND token = '6HABYjSznQeT1r7CCiXBLypQCAz6Ym3l5/K93iyZrTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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