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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584991d3f4b69a8f9ccde699f61f765540f2b07f7897ac64b91828ed06c42e68' 
  AND token = 'V5yhqUjpEBJFaZRN9g59bvmkf4tf0HCtdBlvHQhZDHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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