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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e738dc0dacad28c5269cc02ffdfb9e86adb83fa3dd480936334f8305d45bbcc1' 
  AND token = 'y3G95kW5K2XtEu6kYlQY7Wp941zNvvHl21GfOZOXNWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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