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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e2398e2d8ae4b533f89bb3a71b3abb8db5f04a31493392736acf29ff6636b6' 
  AND token = 'RX1JbrlY/befOjK3K3BuXrnSE99px23psVqGAAoje6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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