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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d64975460ad243ee1f59e46795bf4588ecbaad36b7fdf2ea12d4963b25df84f' 
  AND token = 'oCayRhXmBBVJsG4a5xSy8WjoPNjyL1fE9qMF3OYVb8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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