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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87aea557f3334c8becd02402d9cad20c0e73a3db4595e112f0ee3e0d70c681a3' 
  AND token = 'DEqLcl3lD38sOjbh8mCzQzWYHibPoLuO4mxROwrYOmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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