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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12c93f5e015ba31017f0d51f3f906283c3641659b6dd3db16659efae335e745c' 
  AND token = 'Zi1xAgERjlF+C2tESU25BkG4jVR5UzSZxFCDe39CRtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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