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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e110deaeba19dfc5fdae44510669f9f39bbff90929e5ea1204ebab7d27cdadf' 
  AND token = 'zI2QmQqtWilvUPJ93FnbCMOc8yMKBnVLcKmOtt/5VbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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