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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d5ebc2d5d89f030807baafa3f7c8124597ed7d0b152060019ee712a7d81c35' 
  AND token = '41TQhZKUM71onouTsXj4XBP9QdT7WgziQVSRqVh9cHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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