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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c810c241087ff5e38e16593fa2898d1e71b2017ec2776750f60e13e98963c6' 
  AND token = 'akZuZ9uefdyvps04iozOFloqQFjPbxa/WhQ5WI/jRNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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