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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca47f8753aba5b16e5a62e440080c8dbf6d76da4c85fe8f6d3d8eff9711292ce' 
  AND token = 'HQ6WpQA06E4q9hRRJNozd/sdpRnNr5grSn1Ax/GMSmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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