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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61056a4a62eae3dc41f562af33151be3b2fa646ad4bb471fd357e9afb3d1e38e' 
  AND token = '/L3TjdnZIPyVguQCfHhcq6ErUllAM8NflV3SZVbGWTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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