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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a8ac788a5c73e0e4ff74ccafb6de4cb6f6e57d48a65be2bcb33234199ad7f07' 
  AND token = 'IvQKkLXnfiSaNar8vuUe8p4PzRg/F+mZxRrUt++fIIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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