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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43b284de0aef4b25c83b8d7189f96c4001718e07cba60e84b3e807138d71c929' 
  AND token = 'kd8WE+YcqdoF6rzN2RJFIuOYQPg5+h5XMj/Oi2N/XCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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