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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47962c5055e04e0f754da4ad38fc915a452f723e1ec7fd5dbe1b96f94c089b6' 
  AND token = 'ybUoSBPqLtl4xx6yKlSWyc/1ZDSv/2MQQyy3SioOuKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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