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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e02bfe64da9a214295d3755b11b1f0a92ebb282c468ca9e86f5373ab877403b7' 
  AND token = 'unfYeN4eHOMlziB5sVqpx0RxdQsvTVwLc2Q0vXGCrHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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