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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d2e76227b248d08757ce9fa4aae4264daecc36987b44f26b3ac7c468d5b9f75' 
  AND token = 'HR7ujSwnNiKLdepvx+12m4eYvbZT/7d2ZAcp5dv5m/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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