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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c6f3508f1d8f4ebf63cf00d19dbf6d93794c46c5674531e58f23647e680f27' 
  AND token = 'mG750ry+sd4Nixdc1ijq+oJnhaeHCFGTQpMBvlZzf+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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