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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdcc87c047d97e2218477bd6c763d7dd360f3a4e6a6977a2f4d22ed2dd9cb9e7' 
  AND token = 'L9XfI5EhF60DYLeKsMEkTG4hc/VRzwIEUdrA8iYKmCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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