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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c6061b0112a4561075152436abe25db32bf3562ab3a9475f601b97e72cf848d' 
  AND token = 'gBgr38H6jdY6Xc86228ZrMVRh7B3O9kZ006ovDn6XZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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