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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f1b3eda5a1db0fe5d6f711bef83077474dc60ac339e3bc29367e365f26cc16' 
  AND token = '/YmHW+vQl6pDihymOl+9DQsi1NKnoaUTbNgM6tOh0Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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