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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7699d1b4ec23ad9f223b20994d80e77908f78564f106b2b46bc25e0aeb705750' 
  AND token = 'sYuH1lFkr+RvyKIh8W69qhhZ8Ks36IlNp0a2IrCOUTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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