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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2dfc8147db19f43bb0e625e3ece081ff8faafb69ce33ec80cb7716af8ad40a' 
  AND token = '899QhRlxjZ0gQg72lX8M6gLrXpZlWK7lufBtPVy0C64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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