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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba8804152d9549a348d3284d20c27c4c64e58a4c51e5cb4349d26cad36c4722' 
  AND token = 'u/bfXM/crNMKFiyfE+x2TgdbYm7Yr+FOSuTzWH0JQv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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