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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9003979f475814a8a15bc3efe499d29371a672225f2e7286cc583532a4e36a' 
  AND token = 'hsmO1j6Sz1gzIT7fZhzRm43Y5L11oxRFmVreElRXDIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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