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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c4cacff6d4b8f7947951c3649d75aef10003ddc4b1939a6456e1d6863e14cdf' 
  AND token = 'aVJsUjAuRPbLIoDLwy68Ya7boVl/T7WHiy67bgGFst4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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