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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0cd31c5523e95b3b73c81f7eee231f048895ef99149f35736def922d9a696c7' 
  AND token = 'unV3wugV4EBbhS0DKD6M737NfRBw8YxvNrb3OQyHF+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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