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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc503ad36655acc0a044d399c917cde9981bb4519f6943c9db0d8501257b2d2' 
  AND token = '6VF3TeNzXJHurRnRCdFyE8nUsql4Svwv87LPBLQi7/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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