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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ca521586efc44ca0d099c3062814de637332f9c08aec83629d4a0c29be9b29' 
  AND token = 'gqXxn8p1QGBjKVZoJc2dVXaW1Tvz1e8eoIPaYboE9nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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