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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54d18f97a347c54b35ece83cd5b56e5f71d3ca59a2fbc130d79ba1a9a16db978' 
  AND token = 'imO20ropaymgtsQs34BRD0M6uvLYRNmy6lC30ujnhkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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