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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c642db25214491a511d6be6b034e0c39d3b7c526f176c133da742dd1c5648de5' 
  AND token = 'eS9XU1XyNJej56uPo4l4bOz5+uBInPY/QPX7OHMCbGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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