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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98069f4bef7f7f84367ae0db7798bcb5c11bb071649b52731eb5d52a2d2b8bba' 
  AND token = 'XqgnREOj6PxjEKPV3aSO2/PEbAPUVCqPTZ9Pq1XIG+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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