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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9f5d2e6ba0b8e414dbac1003a4a11983ef9ca4b832419fd0aaf5132c3428a0' 
  AND token = '515+olnqiXZJOf7mL6S+2+xtFgL0IsuaahqR42b2Mm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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