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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a20e007405c6608c547917a6d17cecf1da809334a93d2eea9ca7ee1565ffa4' 
  AND token = '7sK0xt7lhcxkLSYKVO5sRaIJrB/U+dH8r+8RYX1e5JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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