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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9eeabef108af3628077ffcb4753105630e98e31428703f61c6d865193d13a7' 
  AND token = 'UsQ4chnfAHfl9aQM59Rhx+y/02UeE7GI1pSdJGUuGuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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