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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d4adcef9385671300c21214b14f7d2ba383b47e2246ffd72eba9d6e2fde1922' 
  AND token = '/KzBrrEEjMA7RX/jncbIe9RFsfv2z7lg5U5qC7c9ud4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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