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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2976e569ca131d1b8fc518ca6c7889baf1c48c4a41c9bc83c153040bef3a76de' 
  AND token = 'bfpaNLqOTR3pUc1ACMjcfJphKTbnTgdifzHjKvQ1qHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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