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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37755c7816c6797c3982b2c6fafb7d17bb0faf30af036e9012db3e6e63caaeb4' 
  AND token = 'SKa5YuEU7k7DklmclSQHCVyVnhCjFzCQbFAmI/UIb28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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