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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c763343e04dc753dc5fff84023f54ecad084340259ec46407fc26adf506d83f9' 
  AND token = '6X0H81TNph55dKHxI7SW4/2Ebu/1NXpddsawq4yi79E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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