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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5352d8935b6f0c12f81f24acc41396b61daf62883df073be57d9046ebf9570af' 
  AND token = 'dzTv0ARnvVoPqWlbzINz369/7GPFLT4z88W05F8/TcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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