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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2dd9c4cebf61521df8f66f256575d9b522daf7e57a61a6348d90dd7608c4a70' 
  AND token = 'toVceF3DqYD+yTeVpeIYxfiBAu6E4RxRF+q9u4MyhAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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