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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e8ad99eb8bf8a95bf09da62b22644fcd30dfecad0d87cae2dd5d24b68a9e70' 
  AND token = 'WTeFuGPbaFmw9MJhLjEY7J1dBgTS3VeuAMyhG8KeH7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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