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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8f4192fb3d5c51ea33b805d2dbf46dd6dc10a32dd7309cd18ff867cde6585e1' 
  AND token = '76mx+zugYL5vJgzIeJKS3pQy9bUG+p3O6euRt1aXkRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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