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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f8883808a5e13f0ac5dc8d807a6876b0d03529486687d38fe6ede5c793b7354' 
  AND token = 'C6DLEgsN3wFqwFflen7mn6/z4dBtWGNDTlklA0EJk7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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