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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea515198f786dfdc09efd210528d64b7ba387eb77deb94c8a913f80f91c8813' 
  AND token = '1IdlEyW/V5VD7EN8Vdpub0ACIt6N0ynZn/SkcB4xMfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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