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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ac68b9e67f8f6fa860b46df79b7f01e6999b8c52bb559bf61f3ae0c8978398' 
  AND token = 'K59DjWMTIhK2H55BcDhahTKBNWO1618Dc8CqyInj8B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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