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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a69369458783ee76ef8e1d52dd5f6a5d8a53c3b488bd10205fc298ead23d9d6' 
  AND token = 'F69U7ywBJ9d3no+e9ipO0RGGJDJ+CE16eySTUoTlU6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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