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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979a1b5448307499620575c34f4832ac801b9ce79930153096f35e20fb7e47e8' 
  AND token = 'OCXR1/4nJQlNjaosnqDD5N2ZQDz/Oly7QXv5y/o41xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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