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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec35ebf93ea69b163318e6b80e359981eaced77d333fd5f2131013bcd1d90480' 
  AND token = 'jssg7SNSGGJqCfBZhWZTRODljXhs16I6q7u9Wu5lShU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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