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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956bc8e63a08ea6c2766058d2943ac21e2a455b549fb9933db9282005b99f4ff' 
  AND token = 'BjG9nSEtT4bkTdTxskOjA99eeqnlcQJa217vzSfa98o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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