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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e548a57a1e8d349516c4e636883d82e1ed9dfd140bc5eaa28fbb7716e6bae838' 
  AND token = 'ihiWQP411gk30rUty+JCKZaWQlAYhLO36ko1k0cYK9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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