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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13854a4e9f7d53f0592370ee1468de3fb05b17f9f74ae376349a6dd7cc63827c' 
  AND token = 'X5jA8wHJBpW9rcPzxnKHXUEYI86sTW6jNOe/SUm7QkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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