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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7067a1982ca3b2462138bed9c6b9fb9165c49fb5003b4b32445052b5c1bfd0b8' 
  AND token = '+MxabsJKNMwNnZDEuzakh1KXGbIr7wqXYB+ZnEbZ7Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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