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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e33460fb1b5bb7c0cd24fa728fc67470dc9a25e0e2e350f8356a5d1a3a6bc16' 
  AND token = 'AIRMjMlWoGRR5nu/f6WS1l/AnS53xR9pcyaDlO2LmIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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