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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf785b880602c79e8bd4d6e12f261aeb736387711ac02a5ef53d2217a0d805c' 
  AND token = 'R7Ogz8BZDg++6Z6azV7ilpB6iCTxk6p/7otF7lKToBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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