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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b6392cd7214d29c8e8d8123ee59d9e46742db55c8b479d59a15a3c778ea650' 
  AND token = 'JI9OPcktHK212i5rr8MnZy0tyaVJUwEVCBqcwAzy700=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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