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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b6f15b286d21e4585fc0790264963d01e14d443f9fef4a3ab21f01e5583d05c' 
  AND token = 'Dazv5i/NLre8lE6Ho3b5bWK1Vtuirp9RoYBtFtLjdi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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