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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b608767d86d8cf7718fd12674634944ec696edb1546324fcc1af145105e4d35' 
  AND token = 'KQKo0ksdjggf+hWW/xWoK0M23rAkYD1GyzRFAm4bz50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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