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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fbf474c790ec6b61d52d17e6f37163196d98c0a7ae3602674f52bdb7b4f3c38' 
  AND token = '75/DLl6FA9Ib6WLeRjFnY1DHZrmcJ62FJFY+4kdfruE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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