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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c0cf5a27bc4a0cb8c86b8b5b8e6572c504204251553d702809b9707b2adb753' 
  AND token = 'mGmnubOt+I/dQ/4lSnSdQb6ROi3pOVjoVZD2TFhG2zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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