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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97940675273e02b7f47983466463188a9f62fb5402bf3421740da3424933be95' 
  AND token = 'iWvyMCFwStHLvWibw6N5bqksLUv8XgRAdEp4+e/p9mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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