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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e5d84aa8545e8894d2c75f75bbb4a26191f434e8e61fd8b89ee5427b9135c3' 
  AND token = '0ALyi1MFh0JFH2WVhaMNObgf5YASi3OpRXa6DIdLyfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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