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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401acc08f4ba7d48db215ca9dda3c94c8078fc3266d1867c41bfbce2156b06c4' 
  AND token = 'qnUwJVnlCOtXuT0PhwIn/ou8+IYIRYZ4JX0CPi1YtQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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