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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a912f7aaa26edaa6075dc593e7d99e0353350fe95c2e4f1402949624fee6dd' 
  AND token = 'dum8Dyn1CQu6p3VAA7d6MEPljRAm/le8KBzE0Dto1aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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